Why is the product of P(pressure) and V(specific volume) not zero when P approaches 0?

The water pressure at the base of the water tower shown in the figure is 3.2 bar. The water level is L = 25 m above the tower base. The density of the water is 103 kg/m³ and g = 9.81 m/s². g=9.81 m/s² Pwater = 10³ kg/m³ Water P Air L Determine the pressure of the air trapped above the water level, in bar and in lbf/in².

3-76 A system consisting of 2 kg of ammonia undergoes a cycle composed of the following processes: Process 1-2: Constant votume from p = 10 bar, x = 0.6 to saturated vapor, Process 2-3: Constant temperature to P3 = P1. Qz= +228 kJ. Process 3-1: Constant pressure. Sketch the cycle on p-v and T-u diagrams. Neglecting kinetic and potential energy effects, determine the net work for the cycle and the heat transfer for each process, all in kl.

A piston-cylinder assembly contains a mystery substance that undergoes a series of processes. Process 1-->2: Constant pressure process at 5bar from v1=.07m3/kg to v2=.12m3/kg Process 2-->3: Constant volume process to saturated vapor Process 3-->4: Constant temperature process to quality of 50% Process 4-->5: Constant volume process to 5bar   Sketch the processes on Pt, Pv, and Tv, plots. Lable the axes including property values; use closed dots to show the states, use solid lines to connect the states, add number and arrows to make clear the states numbers and process directions.   Could this be considered a thermodynamic cycle?  Why or why not?

Q2: A U-shaped tube is closed at one end; the other end is open to the atmosphere. Water fills the side of the tube that includes the closed end, while oil, floating on the water, fills the side of the tube open to the atmosphere. The two liquids do not mix. The height of the oil above the point where the two liquids touch is 75 cm, while the height of the closed end of the tube above this point is 25 cm. What is the gauge pressure at the = 1000 kg/m³ and Po = 900 kg/m³ ) 3 3 closed end? (ew = Solution: -Po h=75 cm P3 %3D d= 25 cm Pi Pw

H₂O Po 4.23 Two kilograms of water are contained in a piston/cylinder (Fig. P4.23) with a massless piston loaded with a linear spring and the outside atmosphere. Initially the spring force is zero and P₁ = P₁ = 100 kPa with a volume of 0.2 m³. If the piston just hits the upper stops the volume is 0.8 m³ and T = 600°C. Heat is now added until the pressure reaches 1.2 MPa. Find the final temperature, show the P-V dia- gram and find the work done during the process.

Fluid column contains water, mercury and engine oil. Sequence of fluids from top to bottom are O Engine oil, water and mercury O Water, engine oil and mercury Water, mercury and engine oil O Mercury, water and engine oil

Air undergoes an isothermal expansion as an ideal gas in a closed system.  The air pressure increases in the process. True or False?

A piston-cylinder assembly contains a mystery substance that undergoes a series of processes. Process 1-->2: Constant pressure process at 5bar from v1=.07m3/kg to v2=.12m3/kg Process 2->3: Constant volume process to saturated vapor Process 3->4: Constant temperature process to quality of 50% Process 4->5: Constant volume process to 5bar Sketch the processes on Pt, Pv, and Tv, plots. Lable the axes including property values; use closed dots to show the states, use solid lines to connect the states, add number and arrows to make clear the states numbers and process directions. Could this be considered a thermodynamic cycle? Why or why not?

7. The tank shown in the figure contains a gas at a pressure of 3 bar. A barometer indicates the local atmospheric pressure is 720 mmHg. The density of water is is 997 kg/m³. Let g -9.81 m/s². Determine L, in m, for water as the manometer liquid Tarik Gas at pressure Manometer liquid D